Thermocapillary effects during the melting in microgravity of phase change materials with a liquid bridge geometry

•Analysis of PCM melting in microgravity with the thermocapillary effect in liquid bridge geometry.•The phase change is studied by varying Marangoni and Stefan numbers, and Γ and dimensionless volume.•Results in cylindrical geometry demonstrate an improvement of a 50% with respect to rectangular geometry.•Extended analysis to (stable) non-cylindrical configurations.